RDP “Logon attempt failed” Errors on Windows 7 and Windows 8

Quite suddenly I found that I could no longer log in to various servers on my local network with RDP using a domain password. Local passwords worked fine.

The problem turned out to be related to running RDP 8.0 on my client machines. After much cursing and swearing I found out that all I had to do to fix the problem was modify one group policy on each of the affected workstations. The policy in question was:

\Local Computer Policy\Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options\Network Security: LAN Manager authentication level

and it needed to be changed to

Send LM & NTLM - use NTLMv2 session security if negotiated

Wasted an entire morning on this. What a PITA!

4 Responses to “RDP “Logon attempt failed” Errors on Windows 7 and Windows 8”

  1. gunfus Says:

    This is good info.. but what you are missing is if the entry is a regedit entry or an entry that needs to be modified somewhere else.

  2. lnsgod Says:

    Actually, I state quite clearly that it is a group policy. That tells you where it needs to be changed. In the Group Policy Editor.

  3. Necap Says:

    Does this work on Windows 10 aswell?

  4. lnsgod Says:

    It should.

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